Sagot :
Bonsoir,
(x+7)³
(x+7)(x+7)(x+7)=
(x² +7x + 7x +49) (x+7) =
x³ +7x ²+ 7x² +49x + 7x² +49x +49x +343=
x³ +21x² + 147x + 343
Bonsoir,
(x+7)³
(x+7)(x+7)(x+7)=
(x² +7x + 7x +49) (x+7) =
x³ +7x ²+ 7x² +49x + 7x² +49x +49x +343=
x³ +21x² + 147x + 343